revolutionary (adj.)

"pertaining to or concerned with revolution in government," 1774; see revolution + -ary. As a noun, "one who desires or endeavors to effect social or political revolution," by 1850 (compare revolutionist).

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Definitions of revolutionary from WordNet
revolutionary (adj.)
markedly new or introducing radical change;
a revolutionary discovery
Synonyms: radical
revolutionary (adj.)
of or relating to or characteristic or causing an axial or orbital turn;
Synonyms: rotatory
revolutionary (adj.)
relating to or having the nature of a revolution;
revolutionary wars
revolutionary (adj.)
advocating or engaged in revolution;
revolutionary pamphlets
a revolutionary junta
revolutionary (n.)
a radical supporter of political or social revolution;
Synonyms: revolutionist / subversive / subverter